JP2003279083A - Humidification circuit control device of environmental test instrument and control method of the humidification circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidification circuit control device of an environmental test instrument in which optimum wait time is set at the time of initial water feeding of a humidification vessel, and water is fed without changing temperature and relative humidity at the time of a humidity normal operation of the humidification vessel. <P>SOLUTION: The humidification circuit control device 8 of the environmental test instrument 1 for controlling a small capacity pump 6b and a humidification heater 5b by detecting a water level of the humidification vessel 5a with a water level detection sensor 8a. The small capacity pump 6b has an automatic switching function of intermittent driving and continuous driving. The humidification circuit control device 8 of the environmental test instrument 1 has a water feeding means 6 for switching driving condition of the small capacity pump 6 to be intermittent driving or continuous driving while detecting the water level of the humidification vessel 5a with the water level detection sensor 8a and a humidification heater control means 7 for changing conducting state to the humidification heater 5b to be start or stop while detecting the water level of the humidification vessel 5a with the water level detection sensor 8a. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidification circuit control device for an environmental tester having a humidity adjusting function in a test room and a method for controlling the humidification circuit, and more particularly, to detecting a water level in a humidification container by a water level detection sensor. The present invention relates to a humidification circuit control device for an environmental tester that controls a capacity pump and a humidification heater, and a humidification circuit control method thereof.

[0002]

2. Description of the Related Art In the case of an environmental tester that employs a steam humidification system, the water level of a humidifying container that generates steam continuously decreases during humidification. For this reason, when the water level in the humidifying container falls below the reference water level, it is controlled by using a device that restores the reference water level in the humidifying container by supplying humidifying water from the outside. In this case, the water temperature in the humidifying container is temporarily lowered by the humidifying water supplied from the outside. For this reason, the amount of evaporation required for controlling the temperature in the test chamber cannot be obtained, which causes humidity disturbance in the test chamber. If the generated steam also acts on sensible heat, temperature disturbance in the test chamber will also occur.

Conventionally, in order to prevent the disturbance of the temperature control due to the water supply to the humidifier, it is disclosed in Japanese Patent Laid-Open No. 10-3.
00173 discloses a method of operating a constant temperature and constant humidity air supply device in which humidifying water is intermittently supplied by a water supply means that is an electromagnetic on-off valve or a flow rate control valve.

Furthermore, when the amount of water supply per unit time is reduced, the humidification heater energization delay time must be lengthened, which delays the start of the humidity control.
If the water level of the humidifying container does not return due to an abnormal decrease in the water pressure of the water supply due to the clogging of the water supply pipe, the water level of the humidifying container continuously decreases, and there is a risk of deterioration of the humidifying heater due to empty heating.

Further, conventionally, in a normal environment tester, when a humidifying operation is started, in order to prevent the steam generator (humidifying heater) from being dry-heated until a water level in a humidifying container reaches a reference water level, Humidity heater energization delay time)
Power supply to the humidifying heater is stopped. This humidification heater energization delay time is experimentally determined to be the maximum time required for the water level of the humidification container to return to the reference water level, and is uniquely determined with some margin.

However, depending on the water level of the humidifying container at the start of the humidifying operation and the surrounding environment such as voltage and frequency, the humidification heater energization delay time becomes too long or too short, and the humidity control start is delayed more than necessary or the humidification is started. There is a problem that the humidifying heater is not heated until the water level of the container returns to the reference water level.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and during the initial water supply operation of the humidifying container, waits until the humidity control is started depending on the remaining amount of the humidifying water in the humidifying container. It is an object of the present invention to provide a humidification circuit control device for an environmental tester and a humidification circuit control method thereof, which can automatically change the time (humidification heater energization delay time) and always set an optimum waiting time. Humidity of the humidifying container If the water level of the humidifying container falls below the standard water level during normal operation, the small capacity pump is intermittently driven to keep the water temperature constant, and the water level is restored without fluctuations in temperature and humidity, and a certain time elapses. Even if the water level in the humidifying container does not return to the standard water level even after that, the power supply to the humidifying heater can be stopped and the small capacity pump can be switched to continuous drive until the water level returns to the standard level. It is an object of the present invention to provide a humidifying circuit control device for an environmental tester and a method for controlling the humidifying circuit.

[0008]

In order to solve the above-mentioned problems, a humidification circuit control device for an environmental tester according to a first aspect of the present invention detects a water level in a humidification container by a water level detection sensor, and A humidification circuit control device for an environmental tester that controls a capacity pump and a humidification heater, wherein the small capacity pump has an automatic switching function for intermittent drive and continuous drive, and at the time of normal humidity operation, the water level detection sensor While detecting the water level of the humidifying container, when the water level of the humidifying container falls below the reference water level, the small capacity pump is intermittently driven, and the water level of the humidifying container returns to the reference water level even after a certain period of time. If not, the a small capacity pump water supply means for switching the continuous drive, when humidity normal operation, the pressure <br/> humidity heater to a state of being energized, water in the humidifying container even after the lapse of a predetermined time Is not returned to the reference water level, the humidification heater control means for stopping energization to the humidification heater until the water level of the humidification container detected by the water level detection sensor returns to the reference water level. .

According to the first aspect of the present invention, when there is no need to worry about fluctuations in humidity and temperature fluctuations due to water supply to the humidifying container, the small capacity pump is continuously driven to quickly return the water level to the humidifying container. This can be completed, and by stopping the energization of the humidifying heater, it is possible to prevent the humidifying heater from deteriorating due to empty heating. Also, when it is necessary to worry about humidity fluctuations and temperature fluctuations due to water supply to the humidification container, the small capacity pump is intermittently driven to supply water while keeping the temperature of the humidification container constant. Water supply can be completed without causing.

According to a second aspect of the present invention, there is provided a humidification circuit control method for an environmental tester, which controls a small capacity pump and a humidification heater by detecting a water level of a humidification container by a water level detection sensor. The small-capacity pump has an automatic switching function of intermittent drive and continuous drive, and during normal humidity operation, while detecting the water level of the humidification container by the water level detection sensor, the water level of the humidification container Is below the reference water level, the small-capacity pump is intermittently driven, the humidification heater is energized, and if the water level of the humidification container does not return to the reference water level after a certain period of time, the small capacity Switch the pump to continuous drive, stop energizing the humidifying heater and control the humidifying circuit until the water level in the humidifying container detected by the water level detecting sensor returns to the reference water level. And wherein the Nau.

According to the second aspect of the present invention, when there is no need to worry about fluctuations in humidity and temperature fluctuations due to the water supply to the humidifying container, the small capacity pump is continuously driven to quickly return the water level to the humidifying container. This can be completed, and by stopping the energization of the humidifying heater, it is possible to prevent the humidifying heater from deteriorating due to empty heating. Also, when it is necessary to worry about humidity fluctuations and temperature fluctuations due to water supply to the humidification container, the small capacity pump is intermittently driven to supply water while keeping the temperature of the humidification container constant. Water supply can be completed without causing.

A humidification circuit controller for an environmental tester according to a third aspect of the present invention controls the small capacity pump and the humidification heater by detecting the water level of the humidification container with a water level detection sensor. The small capacity pump has an automatic switching function of intermittent drive and continuous drive, and at the time of initial water supply of the humidifying container, the small capacity pump is operated while detecting the water level of the humidifying container by the water level detection sensor. With continuous drive, when the water level of the humidifying container returns to the standard water level, water supply means for switching the small-capacity pump to intermittent drive, and during the humidifying container initial water supply operation, the energization of the humidifying heater is stopped, and the humidifying container is stopped. Humidifying heater control means for starting energization to the humidifying heater when the water level of (1) returns to the reference water level.

According to the third aspect of the invention, it is possible to set the waiting time until the start of the humidity control (the humidification heater energization delay time) depending on the remaining amount of the humidification water in the humidification container. Therefore, it is possible to prevent unnecessary heating of the humidity heater due to an excessive delay time of the humidification heater energization delay, or it is possible to prevent the humidification heater from being heated while the water level of the humidification container reaches the reference water level due to the insufficient energization delay time of the humidification heater. it can.

According to a fourth aspect of the present invention, there is provided a humidification circuit control method for an environmental tester, which controls a small capacity pump and a humidification heater by detecting a water level of a humidification container by a water level detection sensor. The small-capacity pump has an automatic switching function of intermittent drive and continuous drive, and during the initial water supply operation of the humidifying container, the small-capacity pump while detecting the water level of the humidifying container by the water level detection sensor. The continuous drive, stop energizing the humidifying heater, when the water level of the humidifying container returns to the reference water level, start energizing the humidifying heater, again when the water level of the humidifying container is below the reference water level, It is characterized in that the small capacity pump is switched to intermittent driving and the energization of the humidifying heater is continued.

According to the fourth aspect of the invention, the waiting time (humidification heater energization delay time) until the start of the humidity control can be set by the remaining amount of the humidification water in the humidification container. Therefore, it is possible to prevent unnecessary heating of the humidity heater due to an excessive delay time of the humidification heater energization delay, or it is possible to prevent the humidification heater from being heated while the water level of the humidification container reaches the reference water level due to the insufficient energization delay time of the humidification heater. it can. Also, when it is necessary to worry about humidity fluctuations and temperature fluctuations due to water supply to the humidification container, the small capacity pump is intermittently driven to supply water while keeping the temperature of the humidification container constant. Water supply can be completed without causing.

A humidifier circuit controller for an environmental tester according to a fifth aspect is the humidifier circuit controller for an environmental tester according to the first or third aspect, wherein the small capacity pump is an electromagnetic pump. Characterize.

According to the fifth aspect of the invention, since the electromagnetic pump is used as the small capacity pump, it is possible to supply a constant small volume of humidifying water determined by the cylinder of the electromagnetic pump at regular intervals. Also, turn on / off the electromagnetic pump.
By changing the FF cycle, the flow rate of humidifying water per unit time can be freely adjusted. Furthermore, since the amount of water supplied to the humidifying container per unit time supplied by the electromagnetic pump is controlled to exceed the maximum amount of evaporation of the humidifying container per unit time, it is possible to easily control the intermittent water supply.

According to a sixth aspect of the present invention, there is provided a humidification circuit control method for an environmental testing device, wherein the small capacity pump is an electromagnetic pump. Characterize.

According to the sixth aspect of the invention, since the electromagnetic pump is used as the small capacity pump, it is possible to supply a constant small volume of humidifying water determined by the cylinder of the electromagnetic pump. Also, turn on / off the electromagnetic pump.
By changing the FF cycle, the flow rate of humidifying water per unit time can be freely adjusted. Furthermore, since the amount of water supplied to the humidifying container per unit time supplied by the electromagnetic pump is controlled to exceed the maximum amount of evaporation of the humidifying container per unit time, it is possible to easily control the intermittent water supply.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a humidifying circuit controller for an environmental tester according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a humidification circuit controller for an environmental tester according to the present invention, and is a schematic diagram of the environmental tester and its humidification circuit controller. FIG. 2 shows an example of a small capacity pump used in the humidification circuit control device of the environmental tester according to the present invention, and is a longitudinal sectional view of the electromagnetic pump.

As shown in FIG. 1, the environmental tester 1 comprises a test chamber 1a and an air flow path 1b. The test chamber 1a is a space for accommodating a sample and performing an environmental test, and is required to be at a constant temperature and a constant humidity. Further, the air flow path 1b has a rectangular tubular shape formed by a heat insulating wall, and two openings are provided between the air flow path 1b and the test chamber 1a. Air flow path 1
b is a blower 2, an air heater 3, and a dehumidifying cooler 4
And a humidifier 5. The blower 2 is attached to one opening of the air flow passage 1b, and the inflowing air flows from the other opening of the air flow passage 1b through the air flow passage 1b to generate the blower 2
Is sucked in from and supplied to the test chamber 1a as constant temperature and constant humidity air.

The air heater 3 is composed of an electric heater such as a sheathed heater with a fan, and detects a deviation from a set temperature and a set humidity and is feedback-controlled by a control means (not shown). The dehumidifying cooler 4 has an air flow path 1
It is configured to traverse b and is controlled by control means (not shown).

The humidifier 5 has a humidifying container 5a, a humidifying heater 5b, and an introducing pipe 5c. Humidification container 5a
Is attached to one opening of the air passage 1b, and its upper space is opened to the air passage 1b. Humidification heater 5b
Generates steam from the humidified water supplied into the humidifying container 5a by being energized. The introduction pipe 5c is located near the bottom of the humidifying container 5a and is connected to the electromagnetic pump 6b to supply the humidifying water from the water tank 6a. Electromagnetic pump 6b
Can be switched between intermittent drive and continuous drive.

The humidification circuit controller 8 comprises a water supply means 6 and
It has a humidifying heater control means 7. Water supply means 6
Controls the intermittent drive and continuous drive switching of the electromagnetic pump 6b by the water level (water level detection signal) of the humidification container 5a detected by the water level detection sensor 8a attached to the humidifier 5. The humidifying heater control means 7 controls switching of starting and stopping of energization of the humidifying heater according to the water level (water level detection signal) of the humidifying container 5a detected by the water level detecting sensor 8a attached to the humidifier 5.

As shown in FIG. 2, in the electromagnetic pump 6b, the blanker 6d moves up and down in the cylinder 6c by the electromagnetic force of the coil 6e and the spring force of the spring 6f, so that the humidifying water in the water tank 6a is sucked from below. It is discharged from the upper part into the humidifying container 5a. The blanker 6d is the cylinder 6
The upper and lower springs 6f are balanced in c, and at this time, the intake valve 6g whose lower part is connected to the water tank 6a and the discharge valve 6h whose upper part is connected to the humidifying container 5a are closed. When the coil 6e is energized, the blanker 6d is pulled up by an electromagnetic force, and at this time, the humidifying water in the water tank 6a is sucked up to the lower side of the blanker 6d in the cylinder 6c, and at the same time, the blanker 6d in the cylinder 6c is sucked.
The humidifying water on the upper side of d is compressed, pushes up the discharge valve 6h, and is discharged from the pump 6b. Next, when the coil 6e is de-energized, the blanker 6d returns to its original position by the spring force. At this time, since the upper side of the blanker 6d in the cylinder 6c has a negative pressure, the discharge valve 6h is closed,
The suction valve 6g is opened and the humidifying water on the lower side of the blanker 6d flows to the upper side of the blanker 6d. By repeating the above, the humidifying water is sucked from the water tank 6a and discharged to the humidifying container 5a.
The amount of water supplied by the electromagnetic pump 6b per unit time of the humidifying container is controlled so as to exceed the maximum evaporation amount of the humidifying container per unit time.

Next, the operation of the humidification circuit controller 8 of the environmental tester 1 according to this embodiment will be described with reference to FIG.

First, when the water level of the humidifying container 5a detected by the water level detecting sensor 8a does not satisfy the reference water level at the start of the humidifying operation, this is recognized as the initial humidifying container water supply operation, and in step S1, the humidifying operation is performed. The heater control means 7 stops energizing the humidifying heater 5b until the water level of the humidifying container 5a returns to the reference water level (that is, this time is the "humidifying heater energization delay time"). Then, in step S2, the electromagnetic pump 6b is continuously driven by the water supply means 6 to return the water level of the humidifying container 5a to the reference water level.

Next, in step S3, it is judged whether or not the water level of the humidifying container 5a detected by the water level detection sensor 8a has returned to the reference water level. Water level sensor 8
If it is determined that the water level of the humidifying container 5a detected by a has not returned to the reference water level (step S3: N
O), the process returns to step S2, the electromagnetic pump 6b is continuously driven, and it is determined whether the water level of the humidifying container 5a detected by the water level detection sensor 8a has returned to the reference water level in step S3. On the other hand, when it is determined that the water level of the humidification container 5a detected by the water level detection sensor 8a has returned to the reference water level (step S3: YES), the humidity normal operation is performed, and in step S4, the humidification heater is completed until the humidification operation is completed. The control means 7 starts energizing the humidifying heater 5b.

Furthermore, during normal humidity operation, step S
At 5, it is determined whether the water level of the humidifying container 5a detected by the water level detection sensor 8a is lower than the reference water level. When it is determined that the water level of the humidification container 5a detected by the water level detection sensor 8a is not lower than the reference water level (step S5: YES), the process returns to step S5 again, and the humidification container 5a of the humidification container 5a detected by the water level detection sensor 8a is detected. It is judged whether the water level is below the standard water level. On the other hand, when the water level detection sensor 8a determines that the water level of the humidifying container 5a is below the reference water level (step S5: NO), step S
At 6, the operation of the electromagnetic pump 6b is switched to the intermittent drive by the water supply means 6. The humidification heater 5b continues to be energized. Next, in step S7, it is determined whether or not 30 minutes or more have passed since the water level of the humidifying container 5a fell below the reference water level. When it is determined that 30 minutes or more have not elapsed (step S7: NO), the intermittent drive of the electromagnetic pump 6b is continued in step S6, and water is supplied to the humidification container 5a without disturbance of humidity and temperature in the test chamber. .

However, if it is determined that the water level of the humidifying container 5a has not returned to the reference water level even after 30 minutes have passed (step S7: YES), it is determined that the humidifying container is abnormal or the water supply system is abnormal. Until the humidification container 5a returns to the reference water level (step S10: YES), the humidification heater control means 7 stops the energization of the humidification heater 5b in step S8, and the water supply means 6 causes the electromagnetic pump in step S9. 6b is switched to continuous drive, and water supply operation is performed.

Next, in step S10, the water level detection sensor 8a determines whether the water level of the humidifying container 5a has returned to the reference water level. When it is determined that the water level of the humidification container 5a detected by the water level detection sensor 8a has not returned to the reference water level (step S10: NO), the process returns to step S9, and the electromagnetic pump 6b is continuously driven,
In step S10, it is determined whether the water level of the humidifying container 5a detected by the water level detection sensor 8a has returned to the reference water level. On the other hand, the water level detection sensor 8a causes the humidifying container 5 to
When it is determined that the water level of a has returned to the reference water level (step S10: YES), the humidity normal operation is resumed, and step S
In step 4, the humidifying heater control means 7 switches the energization of the humidifying heater 5b to start.

As described above, according to the humidification circuit controller 8 of the environmental tester 1 according to the present embodiment, the humidification heater energization delay time is automatically changed according to the remaining amount of the humidification water in the humidification container 5a, It is possible to always set the optimum humidification heater energization delay time. Therefore, the humidity control is not delayed more than necessary or the humidification heater is not boiled due to an excessively long or too short humidification heater energization delay time. Further, when there is no need to worry about fluctuations in humidity or temperature fluctuations due to the water supply to the humidifying container 5a, the water level of the humidifying container 5a can be quickly returned by continuously driving the electromagnetic pump 6b, and the humidifying heater can be used. By stopping the power supply to 5b,
It is possible to prevent deterioration of the humidifying heater 5b due to empty heating. Also, when it is necessary to worry about humidity fluctuations and temperature fluctuations due to water supply to the humidification container, the small capacity pump is intermittently driven to supply water while keeping the temperature of the humidification container constant. Water supply can be completed without causing.

In the normal humidity operation, when the electromagnetic pump 6b is continuously driven, as shown in FIG. 5 , the temperature in the test chamber is + 0.6 ° C, -0.8 ° C, and the relative humidity is relative to the set value. -9% R.S. for the set value In contrast to the disturbance of H, the humidification circuit control device 8 of the environmental tester 1 according to the present embodiment allows the electromagnetic pump 6b to be intermittently driven during the normal humidity operation, as shown in FIG. The test room temperature is ± 0.1 ° C. with respect to the set value, and the relative humidity is + 1% R.V. with respect to the set value. It fell into the disorder of H. Further, since the amount of water supplied to the humidifying container 5a exceeds the amount of evaporation required for control in the test chamber, continuous drop in the water level of the humidifying container 5a due to the intermittent operation of the electromagnetic pump 6b does not occur. No heating will occur.

Further, the electromagnetic pump 6 is used as a small capacity pump.
b is adopted, and it is possible to supply a constant small volume of humidifying water defined by the cylinder of the electromagnetic pump. In addition, by changing the ON / OFF cycle of the electromagnetic pump 6b, the flow rate of humidifying water per unit time can be freely adjusted. Furthermore, since the amount of water supplied to the humidifying container per unit time supplied by the electromagnetic pump 6b is controlled so as to exceed the maximum amount of evaporation of the humidifying container per unit time, it is possible to easily control the intermittent water supply.

The humidifying circuit controller for the environmental tester according to the present invention is not limited to the above embodiment, but various design changes are possible within the scope of the claims. For example, in the above embodiment, the humidifying container 5
The a and the introduction pipe 5c may be configured as an integral structure. The humidifying container 5a and the introduction pipe 5c have an integrated structure so that the supplied humidification water can be introduced into the introduction pipe 5c.
By exchanging heat inside, the temperature difference between the humidifying water entering the humidifying container 5a and the humidifying water in the humidifying container 5a can be reduced.

[0037]

According to the humidifying circuit control device for an environmental tester and the humidifying circuit control method according to the present invention, at the time of initial water supply to the humidifying container, the humidity control is started depending on the remaining amount of the humidifying water in the humidifying container. The waiting time (humidifying heater energization delay time) can be automatically changed to always set the optimum waiting time. In addition, when the water level of the humidifying container falls below the reference water level during the humidity control operation of the humidifying container, the small capacity pump can be driven intermittently to keep the water temperature constant and to supply water without fluctuations in temperature and humidity for a certain period of time. If the water level in the humidifying container does not return to the standard water level even after the elapse, the power to the humidifying heater can be stopped and the small capacity pump can be switched to continuous drive until the water level returns to the standard level. It is possible to

[Brief description of drawings]

FIG. 1 shows an example of a humidification circuit control device for an environmental tester according to the present invention, and is a schematic diagram of a humidification circuit control device for an environmental tester.

FIG. 2 is a vertical cross-sectional view of an electromagnetic pump showing an example of a small capacity pump used in a humidification circuit control device of an environmental tester according to the present invention.

FIG. 3 is a flowchart showing a procedure when a humidification operation is performed by a humidification circuit controller.

FIG. 4 is a graph showing changes in temperature and humidity in a test chamber (in a tank) when an electromagnetic pump is intermittently driven during normal humidity operation.

FIG. 5 is a graph showing changes in temperature and humidity in a test chamber (in a tank) when an electromagnetic pump is continuously driven during normal humidity operation.

[Explanation of symbols]

1 Environmental tester 5a humidifying container 5b humidification heater 6 Water supply means 6b small capacity pump 7 Humidification heater control means 8 Humidification circuit controller 8a Water level detection sensor

Claims (6)

[Claims] 1. A humidification circuit controller of an environmental tester for controlling a small capacity pump and a humidification heater by detecting the water level of a humidification container by a water level detection sensor, wherein the small capacity pump is intermittently driven and continuously operated. Having an automatic switching function of driving, during normal humidity operation, while detecting the water level of the humidification container by the water level detection sensor, when the water level of the humidification container falls below a reference water level, the small capacity pump is operated. Intermittent drive,
When the water level of the humidifying container does not return to the standard water level after a certain period of time, the water supply means for switching the small-capacity pump to continuous drive, and the humidification heater is energized during the normal humidity operation for a certain period of time. Humidity heater control means for stopping energization to the humidification heater until the water level of the humidification container detected by the water level detection sensor returns to the reference water level when the water level of the humidification container does not return to the reference water level even after elapse A humidifying circuit control device for an environmental tester, comprising: 2. A method for controlling a humidification circuit of an environmental tester for controlling a small capacity pump and a humidification heater by detecting the water level of a humidification container by a water level detection sensor, wherein the small capacity pump is intermittently driven and continuously operated. Having an automatic switching function of driving, during normal humidity operation, while detecting the water level of the humidification container by the water level detection sensor, when the water level of the humidification container falls below a reference water level, the small capacity pump is operated. Intermittent drive,
When the humidification heater is energized and the water level of the humidification container does not return to the reference water level after a certain period of time, the small capacity pump is switched to continuous drive, and the humidification container detected by the water level detection sensor A humidification circuit control method for an environmental tester, characterized in that the humidification circuit is controlled by stopping energization of the humidification heater until the water level returns to a reference water level. 3. A humidification circuit control device of an environmental tester for controlling a small capacity pump and a humidification heater by detecting a water level of a humidification container with a water level detection sensor, wherein the small capacity pump is intermittently driven and continuously operated. It has an automatic switching function for driving, and at the time of initial water supply of the humidifying container, the small capacity pump is continuously driven while the water level detection sensor detects the water level of the humidifying container, and the water level of the humidifying container returns to the standard water level. Then, water supply means for switching the small-capacity pump to intermittent drive, and during the humidification container initial water supply operation, the energization to the humidification heater is stopped, and the water level of the humidification container returns to the reference water level,
A humidification heater control means for starting energization of the humidification heater, and a humidification circuit control device for an environmental tester. 4. A humidification circuit control method for an environmental tester, which controls a small capacity pump and a humidification heater by detecting the water level of a humidification container by a water level detection sensor, wherein the small capacity pump is intermittently driven and continuously operated. It has an automatic switching function of driving, and during the initial water supply operation of the humidifying container, the small capacity pump is continuously driven while detecting the water level of the humidifying container by the water level detection sensor, and the energization of the humidifying heater is stopped. When the water level of the humidifying container returns to the reference water level, the energization of the humidifying heater is started, and when the water level of the humidifying container falls below the reference water level again, the small capacity pump is switched to the intermittent drive to the humidifying heater. A method for controlling a humidification circuit of an environmental tester, which is characterized by continuing energization of 5. The humidification circuit controller for an environmental tester according to claim 1, wherein the small capacity pump is an electromagnetic pump. 6. The method for controlling a humidification circuit of an environmental tester according to claim 2, wherein the small capacity pump is an electromagnetic pump.